Q: I just got an iPhone 5S. My Apple pswd works on my iPAD but I can't get iTunes apps to accept the same pswd and download apps to my new iPhone.  What's wrong?

Hey there xntricj,

It sounds like you are putting a password for your Apple ID that works without issue on your iPad into your iPhone but get a message saying that the password is incorrect. I recommend the steps from the article named:

iCloud: "Incorrect Apple ID or Password" alert when setting up iCloud after upgrading to iOS 7

http://support.apple.com/kb/TS5207

1. After completing iOS 7 setup, go to Settings > iCloud.
2. Scroll down and tap Delete Account, then enter your previous Apple ID and password.
3. If your Apple ID or password are not accepted, follow the steps in iOS 7: If you're asked for your previous Apple ID when signing out of iCloud.

Thank you for using Apple Support Communities.

All the very best,

Sterling